Merge branch 'feat/add_test_data' into 'master'

Add two Station and two Field test data sets of small sizes (roughly 40KB each).

The data may be used for unit testing.

See merge request !13

windeval/tests/test_toolbox.py

@@ -33,7 +33,7 @@ def test_rootdir():
 
 @pytest.fixture
 def test_data_files(test_rootdir):
-    return list((test_rootdir / "test_data").glob("**/*.cdf"))
+    return list((test_rootdir / "test_data").glob("TAO*/**/*.cdf"))
 
 
 def assert_all_vars_and_coords_equal(ds0, ds1):